accessing known_hosts file on MAC OS 10.6

Hi, I am fairly new to macs. I need to edit the known_hosts file and can't find it. I have tried showing all files by entering this command: defaults write com.apple.Finder AppleShowAllFiles TRUE
killall finder

On the POSIX (unix/linux/osx) filesystem, any file preceded with a . (dot) is "hidden" you can always navigate to them and you can also view them on the terminal command line with -a option. (e.g. ls -a or ls -la.

If you want to open them in the finder, go to the command line and type open ~/.ssh if you're not in your home folder or open .ssh if you are.

If you're removing hosts from the file, then you can just run the following on the command linessh-keygen -R HOSTNAME

You can search for a hostname withssh-keygen -F HOSTNAME

You normally let ssh prompt you to add host keys, but if you have a file, you can append it to known_hosts. I frequently generate a list of known host keys for users to check against or insert into their own known_hosts file.